This is a complex topic that is deeply personal and one size does not fit all. I don't agree with the commonly held belief that this is an addiction for anyone who gets into it. One's predilection toward addiction depends on a lot of individual factors. If you are a young single guy, I don't see the harm in indulging. It's common in a lot of cultures outside of America and most guys don't grow up to be perpetually addicted mongers single for life. They move on from partaking (or not) and have normal fulfilling relationships in many cases.
I would never use it as a substitute for loneliness or non physical needs. If that is what you need, you are looking for love and it won't be found in a strip mall. But if you view it as entertainment, that is totally fine. Like, nobody would say you have a hole in your soul if you spent a lot of time playing golf or taking art classes. It's called a hobby as a euphemism but I think if you actually treat it as a hobby you will be totally fine. The ability to compartmentalize things is an underrated skill but I find it to be super valuable in handling trauma or partitioning different aspects of your life.
Being married adds another layer of complexity. If one is getting regular sex from his wife or LTR, then it would seem a purely selfish need to indulge in this hobby. But for a guy whose wife has shut down or significantly eliminated intimacy, what is he to do? If he has exhausted his options and has made a meaningful effort to engage and redevelop his relationship to no avail, then what?
Hard to judge a guy in that situation. It's like being a meat eater your whole life and then one day without warning you are expected to be a vegetarian. Do you go with it? Hope it goes back to the way before? Or do you find yourself stuck between being an unhappy vegetarian or having the guilt of sneaking out to get Ruth's Chris behind your SO's back? It's a dilemma.
I guess what I am trying to say is if you have the self control to not let it take over your life, do it. And likewise if you have the control to stop if you find yourself in a good relationship, you should stop then too. Ultimately, intimate needs are like eating and drinking. You need constant replenishment. There's no such thing as a one time thing and then you are satisfied. One way or another you need to meet your needs, or accept a lifestyle where your needs aren't met.